Cluster Flies

How do I recognize a cluster fly?The adult cluster fly is slightly larger than the common house fly, about 3/8 inch long. Its robust body is dark gray, nonmetallic, and covered with short golden hairs. The abdomen exhibits light and dark patches of color.

Where would I find cluster flies?Adult cluster flies are most often found around windows.

Do cluster flies die off in cold months?No. Cluster flies enter a building one by one in the early fall to seek shelter from the cooler weather. Soon a cluster of flies will accumulate in their favorite resting places (see above) and hibernate.

At what time of year am I likely to see cluster flies?When the weather warms in the spring or during certain warm days in winter, the cluster flies emerge from their hibernation. Though they usually exit the building, their presence in large numbers inside is often annoying to the building’s occupants.

Does the problem with cluster flies become more difficult to cope with once they settle in?Yes. Once the flies have settled in wall voids and other secluded areas, control are difficult to achieve.

Is there something I can do before calling Critter Ridders?For peace of mind, it is best to call in a professional exterminating company like Critter Ridders to rid you of cluster flies. But you can do something about the problem, too. For temporary indoor relief, remove adult flies with a vacuum cleaner, or use sprays and insect light traps. To prevent reentry in the interior rooms involved, seal the possible entry routes around windows, electrical outlets and door frames.

For effective cluster fly control schedule a preventative service in late August or early September.